Answer:
1. primary
2. protozoa, (or fungi), bacteria 
Explanation:
lmk if im wrong & I'll fix it. 
 
        
                    
             
        
        
        
Answer:
Most liverworts can reproduce asexually by means of gemmae.
Explanation:
These are disks of tissues produced by the gametophytic generation. The gemmae are held in special organs known as gemma cups and are dispersed by rainfall.
 
        
             
        
        
        
The smallest among these 4 groups is Order . Explanation: The arrangements for classification are Kingdom , Phylum , Class , Order , Family , Genus , Species .
        
             
        
        
        
The essential amino acids cannot be produced in the human body and hence these amino acids have to be obtained through the diet. Hence these amino acids have this characteristic that these cannot be produced in the human body and have to be obtained through diet this makes them essential. Hence those nine amino acids are considered as the essential amino acids.